Re: Parallel resistors
Thanks for the replies, guys!
I think all of you answered my question to my satisfaction.
Just to clarify the question; I am writing a suite of software targeted at persons in any trade that have to make electrical calculations with some degree of accuracy.
My question was basically; How accurate does this program have to be to serve the needs the people making these calculations?
Before reading your replies, my program would give a result to the nearest 1/100,000th, being accurate only to 1/10,000th.
After reading your replies, I gather there may actually be an instance where more accuracy is needed. I went back into my program and changed the the source code to give an answer to the nearest 1/10,000,000,000th, meaning it is now accurate to 1/1,000,000,000th of an ohm.
Knowing from first-hand experience how tedious figuring three or more parallel resistors manually is, I designed this program to figure an almost unlimited number of parallel resistors, simply by choosing the number of resistors in the circuit, entering the values of each resistor and clicking the "calculate" button. (I believe the code I am using would limit the program to 80 decimal places).
Just out of curiosity I ran the examples given through my program and came up with the following: 2 ohms parallel with 100,000 ohms came out to be; 1.9999600008 ohms, 220k with 100k came out to be; 68.750k, very close to the required 70k.
I am very thankful to Mike Holt for providing this forum where technical questions are answered by seemingly, very knowledgable and experienced people.